PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·August 7, 2026

17 papers—3 primary·14 cross-listed

All17Primary3Cross-lists14
  1. 01

    TITAN mass measurements of neutron-rich Cs, Ba and r-process lanthanide abundances

    T.-H. Yeh · J.D. Cardona · Y. Wang · J. Ash · B. Ashrafkhani · I. Belosovic · J. Bergmann · E. Dunling · L. Egoriti · G. Gelinas · G. Gwinner · Z. Hockenbery and 17 other authors

    We present measurements for the masses of five neutron-rich isotopes, Cs and Ba, probed for the first time by TITAN at TRIUMF with time-of-flight measurement techniques. We propagate these masses to the nuclear reaction and decay data required for the simulation of the rapid neutron capture process (r-process) nucleosynthesis in neutron star mergers. We show that these neutron-rich masses affect the abundance predictions near mass number corresponding to lanthanide element abundances at and . We demonstrate that these new TITAN masses smooth out the odd-even effect in isotopic abundance predictions near in both fission cycling astrophysical conditions and conditions that do not reach actinides. We further show that these new masses adjust how fission fragments settle into place when forming the final abundances, and consider the effect on comparisons with stellar abundance ratios such as [Ag/Eu], [Sm/Eu], and [Nd/Eu].

    nucl-thnucl-ex0 citations
  2. 02

    Quark matter at finite temperature and proto-quark stars with the axion effects in SU(3) Nambu-Jona-Lasinio model

    Peng-Cheng Chu🇨🇳 · Jiao-Jiao Wang🇨🇳 · Ke Liu🇨🇳 · Peng Wu🇨🇳 · Yu-Heng Liu · He Liu🇨🇳 · Hong-Ming Liu🇨🇳 · Xiao-Hua Li🇨🇳 · Min Ju🇨🇳 · Xu-Hao Wu🇨🇳 · Ying Zhou🇨🇳

    We investigate the thermodynamical properties of strange quark matter (SQM) and proto-quark stars (PQSs) within the SU(3) Nambu-Jona-Lasinio (NJL) model at finite temperature, specifically incorporating the effects of axion fields and vector interactions. Our results demonstrate that these interactions significantly influence the equation of state (EoS), constituent quark masses, entropy density, and the maximum star mass of PQSs at the isentropic stages along the star evolution line. Furthermore, we reveal a distinct thermodynamic signature in the early evolution: the presence of trapped neutrinos leads to a substantial increase in electron number density while simultaneously suppressing the core temperature compared to the neutrino-free case. These findings may highlight the crucial role of the axion effects, flavor-dependent vector interactions, and particle composition in determining the observable properties of compact stars at finite temperature.

    nucl-th0 citations
  3. 03

    Benchmarking electromagnetic observables in angular-momentum projected Hartree-Fock

    Raul Bernal-Gonzalez · Calvin W. Johnson

    We benchmark electromagnetic transitions and moments (electric quadrupole and magnetic dipole) in angular-momentum projected-after-variation Hartree-Fock calculations against full configuration-interaction diagonalization results in a shell model basis. For such a simple approximation we find reasonably good agreement, including for many odd- and odd-odd nuclides. As previous work on excitation spectra found, results are frequently improved in cases with shape coexistence. Here we considered select cases from the - and -valences spaces. While electric quadrupole moments and transitions are, as one might expect, frequently (though not always) well reproduced, especially in even-even nuclides, magnetic dipole moments and transitions are overall better than expected. This continues the benchmarking of projected Hartree-Fock as a simple yet effective alternative to full configuration-interaction as well as an underlying foundation for many other many-body methods.

    nucl-th0 citations

Affiliations

first authorsco-authorsvia INSPIRE